Improvement in machine foe grinding the rolls of rolling-mills



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HENRY DISS'ION, OF PHILADELPHIA, PENNSYLVANIA.

Letters Patent No. 74,203,- dated February/*11, 1868.

IMPROVEMENT IN MACHINE FOR lGdtIhTDIhlG I'HE ROLLS OI' ROLLING-MILLS.

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TO ALL WHOM IT MAY CONCERN Beit known that I, HENRY DISSTON, of Philadelphia, Pennsylvania, have invented a Device for Grinding .the Rolls of Rolling-Mills in their places; audI do hereby declare the following to be a full, clear, and exact description of the same.

My invention consists of certain mechanism, fully described hereafter, to be applied lto the frame of 'a rolling-mill, for the purpose of grinding or dressing the rolls without removing them from their places, thus avoiding the usual tedious and expensive operation of taking the rolls from and returning `them to the frame of the mill. v 4 i In order to enable lothers familiar with machinery of this class to make and use my invention, I will now proceed to describe -its construction and operation, reference being had to the accompanying drawing, which forms a part of this specidcation,and in which Figure 1 is an end view of' a rolling-mill, with my improvement attached. Figure 2, a sectional elevation of the same. Figure 3, a front elevation, partly in section; and

Figure 4 a plan view. Similar letters refer to similar parts throughout the several views. i To the bed-plate A of the mill are secured the opposite frames B and B', in suitable bearings, in which turn the journals of the lower4 roller, C, the journals of the upper ,parallel roller, D, turning in the sliding bearings a a, which are controlled by the usual set-screws b t, the latter passing through the cross-piece at the top of eachof the frames B and B. Acast-iron plate,E, is placed in front'of the mill, in contact ilth each of the frames B and B', andis secured in this position,l by bolts, 'c and-c', the heads of which enter the enlarged portions of T-shaped grooves, d, formed in the said plate.- The opposite ends of the bolts c pass 'through ribs ff,'projecting from the outside of each of the frames B and B', and aresecured bysuitable nuts,

g, and the bolts c are in like manner secured to projecting ribslf, inside the frames, (see fig. 4.) A dove-tailed guide, h, is formed on the under side ofthe plate E, and to each end of the latter is secured, in any suitable manner, a hanger, F'. In the outer ends of these hangers turns a shaft, G, which is provided witha. pulley, j, for receiving a belt, 7", which passes round a larger pulley, k, at one end of the lower roller C. A plate, l, is arranged to slide upon the `guide h, and hts a nut, m, in which are threads, corresponding toV those cut upon a screw-ro d, H, the latter extending the' entire length of the plate E, and turning in projections on the same, and being provided at each end with -a suitable hand-wheel, n, 'as shown in thedrawing. A frame, J, is hung te a dove-tailed guide, p, on the under side of the plate l, and is arranged to slide upon the same, being operated by a screw-rod, g, the threads of'which are adapted t-o those cut in the said plate, (see iig. 2.) The forked arms t' z' oi' the .frame J are situated one on each side of the spindle G, and embrace a pulley, r, upon the said spindle, as shown in dotted lines, g. '2. A key or feather, r', iig. 2, on the pulley r, enters a long groove in the `spindle G,-and prevents the pulley from turning upon the spindle, but dees not interfere with its longitu-l dinal movement on the same. In suitable bearings iu another portion `ofthe frame J','and,.in the present instance, adjacent to the roller C, turns a short spindle, s, having a small pulley, s', for receiving a strap, t', froxnthe pulley r. At either end of the spindle s, and on the outside of the frame J, is a grindstone or buifwheel, L, so secured to the said spindle as to be readily detached therefrom. 4

After several heated plates of 'metal have beeu'passed between therolls, the latter become more o r less heated, and their diameter is increased by expansion, which` is greater in the middle than at the ends of the rolls; hence, if a wider plate than usual is subjected to their action it must berthieker atthe edges than at the middle. To remedy this defect, itV has been customary to ascertain the degree of expansion of new rolls by 'actual use, andthen to reuiovethem from the frame of the mill, and turn their faces slightly concave. The ordinary wear and tear on the rolls have also a great tendency to decrease their diameter in the centre, and thus render them useles until removed and turned to the proper shape.

This operation has to be repeated from time to time in every rolling-mill, and,.as the rolls are of great weight, `much valuable time is lost in taking them. from and returning them to their positions,l objections which are obviated, and the desired surface givento the rolls without changing their position, by the use of my inw-en tion, the operation of which I will now proceed todescribe. y Y I v Let it be supposed that new rolls,` C and D, of a uniform diameter throughout, have been placed in the mill, as shown in the drawing, that they have been tested, and their degree of expansion in the centre when heated ascertained. To counteract this expansion, the faces of the rolls must be grooved cr'turned concave, while cold, the nature of the curve being shown exaggerated by the red lines rv, fig. 4. The plate E is secured to the frames 13 and B', Ias before described, and the first stage of'the operation, when the parts u-rein the position shown in gs. 2 and 3, is to carry the grindstencs or buff-wheels L to that end of the roller-C which is to be rstlground. The screw-rod q is operated by means of its hand-Wheel g', causing the frame J to slide on its guide p, and the stones L to be drawnback from the face of the roller, as shown in iig. l. The screw-rod H is then turned byits hand-wheels n n, and the block z' travels upon'the guide h of the plate-E, carrying with it the frame J, the grindstones L,and the pulley r, which is caused to slide laterally upon its spindle Gr. When p the stones have arrived at the Vproper position they are moved forward, so as to be in contact with' the face of the roller C, by operating the screw-rod g, as before described. .As the frame J- and block Ztravel upon the guide 7i of the plate E, it will be evident that if the said guide is slightly curved, the frame J and its stones L will'travelin a corresponding curve. The long plate E is so constructed that it can be sprung to a slight curve, and this is accomplished in the present instance, by loosening the nuts of the bolts c, and tightening the nuts g ofvthe bolts c', until the plate E is sufficiently bent. Power is then applied to the roller C, and is transmitted' by the pulleys 727', r, and s to thevgrindstones L, which revolve rapidly in contactwith the surface of the roll. The hand-wheels n are slowly turned by the attendants, the frame J moves laterally, and the revolving grindstones are caused to traverse the roller C from end to end, grinding the face of the same to the curve of the plate E. The upper roller D is next to be treated in a similarmanner. The plate 'E is removed from its posi* tion,`raised, and bolted to the upper ribs f; it is then bent, as before described, motion is imparted to the stones L, and the operation goes on as before. v

' Rolls that have been worn down in the centre are dressed, as above described, until their surfaces are of Ythe proper shape. If, for any purpose, straight-rolls are required, when grinding the same, the plate E is not bent; and if it be desired to havev the faces of' the rolls slightly convex, the plate E is bent in a direction oppoi site to that described, by tightening the nuts of the outer bolts c, and' slaokening the inner bolts c.

When two griudstones are used upon'the spindle s, they are some distance apart, and each stone is intended to work upon its own end of the roll, but I have found in practice thatjn dressing large rolls, when two stones of the proper si'ze are used, the strain is too great upon the frame J. It will be evident, however, that by a slight modification of the form of the frame a single stone can be hung tothe same in such a manner as to act on the whole surface of the r'oll.

I claim as my invention, and desireto securel by Letters Patentl 1. Aplate E, secured to the frame of a rolling-mill, and having a guide for receiving a traversing-slide, which carries a grindstone, or other grinding-wheel, to which a rotary motion is imparted, all substantially as and for the purpose herein set forth.

2. The plate E', in combination with the within-described devices, or equivalent devices, whereby7 it can be made to assume different curves, asand for the purpose specified.

In testimony whereof, I have signed my name to this speciicationin the presence of two subscribing witnesses.

HENRY DISSTON.

Witnesses:

JOHN WHITE, W. J. It. DELANY. 

